...one of the most highly
regarded and expertly designed C++ library projects in the
world.
— Herb Sutter and Andrei
Alexandrescu, C++
Coding Standards
PolymorphicFunctionObject
A type that can be called and that follows the TR1 ResultOf protocol for return type calculation.
result_type
result_of<Fn(A0,...An)>::type
The result of calling the Polymorphic Function Object.
fn
a0,...an